PSUD possible issue on corner case power supply
PSUD gives me this result on a particular power supply (yes, the choke is underspecified on purpose).? Playing with rectifier leak mitigates the problem somewhat, but it still looks unnatural.? Is this a math problem or is my rectifier in actual danger of blowing up?
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Re: DHTRob PSUDII guide/tutorial
Is the 39 nF silver mica cap (between the HT legs) a correct value? I can only find 39 pF in Mouser catalog
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Re: DHTRob PSUDII guide/tutorial
Thank you Evert, I don't remember where to post the link but Duncan posted that the recommended "simulate" set is for "100ms" after a reporting delay of "0" S to see the best real ripple your PSU is doing.
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Re: DHTRob PSUDII guide/tutorial
very reliable info
well known amp builder?
evert
Verstuurd vanaf mijn iPhone
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Op 26/03/2022 om 17:05 heeft felipe cerrillo vindel <fcv@...> het volgende geschreven:
?Attached DHTRob manual/guide, could I trust him? or do you have a better tutorial/guide to use PDUII?
TIA
Felipe
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Can you check the location that you're trying to load from using Windows Explorer (file manager), maybe by trying to rename a file to see if you have write access to the file. PSUD under Windows can only work within the permissions it's given from the OS, so I suspect this is outside of the control of the app.
If the files are somewhere that worked well years ago, but doesn't work well now, for example the Program Files area, you might need to copy and move them to somewhere more "friendly" and it may ask you to temporarily elevate to Administrator privileges to to do it.
Regards,
Duncan
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DHTRob PSUDII guide/tutorial
Attached DHTRob manual/guide, could I trust him? or do you have a better tutorial/guide to use PDUII?
TIA
Felipe
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Win 10,? kept current.? Build 76.
Thanks,
Jack
On 3/26/2022 9:30 AM, Duncan Munro
wrote:
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Would need to know about your setup: Type of operating system
(MacOS / Windows), version/build of PSUD from Help|About.
Regards,
Duncan
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Would need to know about your setup: Type of operating system (MacOS / Windows), version/build of PSUD from Help|About.
Regards,
Duncan
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I haven't used this for a while and now find that I cannot open any of my saved .psu files.? Looks like some permissions issue.? Any suggestions?
Thanks,
73 Jack KZ5A
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Hello Duncan,
Thanks again, attached requested rectifiers.txt file.
Kind rgds
Felipe
Hi Felipe,
It may be you are using the more modern version of PSUD II which doesn't use rectifiers.txt? If you go to Help -> About it will tell you the version number. If it's build 74 (version 2.20.0) or higher, then rectifiers.txt is replaced by individual .rect files
to make it easier to share rectifier models around.
There are the following resources available to help with the later .rect files:
- The help file under Technical Information gives a short description of how to add your own rectfiers
- There is a YouTube video at??which talks through the process in more detail
- There are some support spreadsheets to go along with the video on this groups.io page at?/g/duncanampspsud/files/documentation
If you have an earlier version before 74 then something is badly wrong, but it sounds like you have the later version.
Regards,
Duncan
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Hi Felipe, This is the old version so the previous advice will not help you. Could you please email your rectifiers.txt file to me at postmaster@... and I will take a look at it for you, thanks. Regards, Duncan
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Hi Duncan,
Thanks for support, attached screenshot.
Best regards
Felipe
Hi Felipe,
It may be you are using the more modern version of PSUD II which doesn't use rectifiers.txt? If you go to Help -> About it will tell you the version number. If it's build 74 (version 2.20.0) or higher, then rectifiers.txt is replaced by individual .rect files
to make it easier to share rectifier models around.
There are the following resources available to help with the later .rect files:
- The help file under Technical Information gives a short description of how to add your own rectfiers
- There is a YouTube video at??which talks through the process in more detail
- There are some support spreadsheets to go along with the video on this groups.io page at?/g/duncanampspsud/files/documentation
If you have an earlier version before 74 then something is badly wrong, but it sounds like you have the later version.
Regards,
Duncan
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Hi Felipe, It may be you are using the more modern version of PSUD II which doesn't use rectifiers.txt? If you go to Help -> About it will tell you the version number. If it's build 74 (version 2.20.0) or higher, then rectifiers.txt is replaced by individual .rect files to make it easier to share rectifier models around. There are the following resources available to help with the later .rect files:
- The help file under Technical Information gives a short description of how to add your own rectfiers
- There is a YouTube video at??which talks through the process in more detail
- There are some support spreadsheets to go along with the video on this groups.io page at?/g/duncanampspsud/files/documentation
If you have an earlier version before 74 then something is badly wrong, but it sounds like you have the later version. Regards, Duncan
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I added some rectifiers to rectifiers.txt, but when open PSUDII aren't available?
TIA for help
Felipe
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Hi Chris, I had this issue a while back, it's security related. Please check Message #20 within this group for some suggestions that may help. Regards, Duncan
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Good morning. ?Running MacOS 12.1 Monterey. ? When I opened psud this morning, I got the following error popups.
Clicked "OK" in both cases to ignore, but psud does not open.
Downloaded build 77, but got the exact same error messages . . . ??
Any ideas?
Chris
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Hi Duncan,
The small resistances are the wire.
The circuit is as built in the amp. I know I can parallel up the
parts and had done so in the initial run.
effective saves 10s in execution, gains 10s in delay.
I ran into OOM issues with much simpler circuits and similar delays.
The power supply does take a while to stabilize on a plain old VOM
from a cold start.
AND PLEASE fix Save As... to the same folder as the orig and
preserve the name to allow me to make a Rev change if I load from
recent on the File menu ?
C:\Users\%user%\AppData\Roaming\psud\examples??? Never!!!!
- Ian
On 12/12/2021 12:01, Duncan Munro
wrote:
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Hi Ian,
This circuit is problematic in a significant number of places.
R1 - 10 milliohm resistor goes into 40uF capacitor with series
resistance of 4.24 ohms and an inductor with resistance of 25
ohms. I'm really not getting what that 10 milliohm resistor is
doing for you? All it will do is force the simulator to review the
tiny RC constant of 10milliohm/40uF into smaller and smaller
timesteps until it breaks or you run out of memory.
Similar with C2/C3/C4 and R2/R3 balancing them. Again, this will
force the timesteps to be very small and consume memory. These are
loops with potentially high currents that can only be balanced
with microscopic time steps (long sim times and lots of memory).
C2/C3/C4 can be replaced with one 600uF capacitor with ESR of the
three resistances in parallel. R2/R3 can be removed - they are not
contributing materially to the PSU output.
A power supply shouldn't take 80 seconds to stabilise, this will
exacerbate the problem. As will running high accuracy with the
aforementioned values that the simulator will struggle to balance.
Regards,
Duncan
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Hi Ian,
This circuit is problematic in a significant number of places.
R1 - 10 milliohm resistor goes into 40uF capacitor with series resistance of 4.24 ohms and an inductor with resistance of 25 ohms. I'm really not getting what that 10 milliohm resistor is doing for you? All it will do is force the simulator to review the tiny RC constant of 10milliohm/40uF into smaller and smaller timesteps until it breaks or you run out of memory.
Similar with C2/C3/C4 and R2/R3 balancing them. Again, this will force the timesteps to be very small and consume memory. These are loops with potentially high currents that can only be balanced with microscopic time steps (long sim times and lots of memory). C2/C3/C4 can be replaced with one 600uF capacitor with ESR of the three resistances in parallel. R2/R3 can be removed - they are not contributing materially to the PSU output.
A power supply shouldn't take 80 seconds to stabilise, this will exacerbate the problem. As will running high accuracy with the aforementioned values that the simulator will struggle to balance.
Regards,
Duncan
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On 12/12/2021 09:40, Paul Reid wrote:
On
12/12/2021 12:14 PM, Ian Eales wrote:
I get OOM messages when I try to simulate
over 80s delay.
Seems slightly lethargic given the hardware?
For what circuit??
Also: what do you expect to change at 80 seconds?
Tubes to get hot, voltages to drop, currents to stabilize.
Memory utilization rises from 3.38GB to 3.73GB. PSUD set for High
accuracy.
Back in the day when bytes mattered, we didn't make a humongous
table for simulations, but used a looping algorithm to preserve
memory. Since PSUD results are not time scrollable, after xx seconds
should essentially be unlimited.
16bit legacy issue ???
I think more details of your circuit are needed; maybe the PC
also.
...
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On 12/12/2021 12:14 PM, Ian Eales wrote: I get OOM messages when I try to simulate over 80s delay. Sorry; attachment fell off. Showing 7 sec for 99 sec.
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Ian Eales
Paul Reid
